Saudi Arabia, in particular the location of Islamís holiest sites, Mecca, has recently been inundated by swarms of locusts, crickets and cockroaches. Social media users have posted images and uploaded several videos of swarms of locust infesting the Great Mosque of Mecca, the holiest in all of Islam. It is the focus of the hajj, the pilgrimage, which draws millions of Muslims a year to Saudi Arabia.